Final answer:
HFO refrigerants are miscible in synthetic lubricants which is crucial for maintaining efficient operation in refrigeration and air conditioning systems.
Step-by-step explanation:
HFO refrigerants are miscible in synthetic lubricants. This is an important characteristic for the refrigeration and air conditioning industry, as the refrigerant and lubricant must be compatible to ensure efficient system operation. HFO (Hydrofluoroolefin) refrigerants require synthetic lubricants because they are generally more stable with the chemical composition of HFOs than mineral or other types of lubricants.